package servlet;
import Util.Page;
import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
@WebServlet(urlPatterns = {"/user"})
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //创建业务层对象
        UserService userservice = new UserServiceImpl();
        req.setCharacterEncoding("UTF-8");
        String action = req.getParameter("action");
        if("list".equals(action)){
            //接收参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            User condition = new User(name,pass);
            String currentPage = req.getParameter("currentPage");
            if(currentPage==null){
                currentPage="1";
            }
            int int_currentPage = Integer.parseInt(currentPage);

            Page page=new Page();
            //查询总记录数
            int totalCount=userservice.count(condition);
            //绑定page相关参数


            page.setTotalCount(totalCount);
            page.setCurrentPage(int_currentPage);
            page.setTotalPage();
            //计算偏移量
            int pageSize=page.getPageSize();
            int offset=(int_currentPage-1)*pageSize;



            List<User> users= userservice.findAll(condition,offset,pageSize);

            req.setAttribute("users",users);
            req.setAttribute("condition",condition);
            req.setAttribute("page",page);
            req.getRequestDispatcher("/list.jsp").forward(req,resp);
        } else if ("add".equals(action)) {
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userservice.addUser(new User(name, pass));
            if(result>0){
                //重定向 再次查询
                resp.sendRedirect("user?action=list");
            }
        } else if ("delete".equals(action)) {
            String sid = req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            //根据id查询用户信息
            int result = userservice.deleteUserById(id);
            //重定向
            if(result>0){
                resp.sendRedirect("user?action=list");
            }
        } else if ("toupdate".equals(action)) {
            String sid = req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            //根据id查询用户信息
            User user = userservice.findById(id);
            //将对象存储在作用域中
            req.setAttribute("user",user);
            //在那个页面显示
            req.getRequestDispatcher("updateUser.jsp").forward(req,resp);
        } else if ("update".equals(action)) {
            String sid = req.getParameter("id");
            Integer id = Integer.parseInt(sid);
            //拿到页面传递的参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userservice.updateUser(new User(id,name, pass));
            if(result>0){
                resp.sendRedirect("user?action=list");
            }
        }
    }
}
